Two dads!

You can definitely hold two people & your bouquet while walking down the aisle. Many brides walk with mom & dad & hold them both, so I don’t think it would be an issue.
You can also have one of your dads walk you half way down the aisle where your other dad meets you & takes over.

Loop their arms through yours and hold your bouquet or if possible hold it in one hand.

I was just thinking about this also as I’m having my two sons walk me down the aisle! I looked at images on Pinterest and another option would be for both men to put their arms through yours as if they are holding you up, instead of the other way around if that makes sense! It would be easier to hold your bouquet.

Welcome to the WeddingWire community Ariel!

It is definitely possible for you to have both your dad and your stepdad walk you down the aisle. You would just have you hold your bouquet in one hand as you make your way to the altar, or you could ask them to slip their hands through your arms are you hold your bouquet. Perhaps you could have a couple of practice goes to see what you find most comfortable?